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Talesun TM7G78M-615W
Talesun Brand review

TM7G78M-615W

615 Wp TOPCon Bifacial 80%
ComparePV verdict

Middle of its segment, heavy for its output

Rank 3,874 of 14,005
Compare panels Datasheet PDF
Power (Wp)
615
Typical for its class
Efficiency (%)
22.00
Weak · bottom 7%
Density (Wp/m²)
220.0
Weak · bottom 6%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
35.0
Weak · 2.3 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

The Talesun TM7G78M (BIPRO) series was designed to maximize yields where every meter of structure counts - these bifacial modules utilize TOPCon cell technology, enabling efficient operation even under low irradiance and demanding operational conditions. The application of heterojunction cells with a 16BB configuration minimizes internal losses and improves operational stability, translating to more predictable annual energy production.

In practice, the TM7G78M (BIPRO) addresses typical challenges in large-scale installations: power drops in hot weather, uneven illumination, and the risk of degradation over the long term. The reinforced construction and enhanced PID resistance increase investment safety, while the IP68 junction box ensures reliability in high-humidity, dusty, or strong-wind environments. This is a suitable choice for PV farms, ground-mounted installations, carports, and commercial projects, where the additional rear side gain from the module provides an advantage.

Ranking

1,086 panels in the segment TOPCon 600-650 W
Metric This panel Median Position in segment Overall rank
Module efficiency 22.00% 22.80% Weak · bottom 7% 6,517
Power density 220.0 227.7 Weak · bottom 6% 6,655
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 56.9 53.1 Weak · bottom 3% 10,921
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 3 caution
Best for

Commercial, utility-scale and shaded-installations.

Not ideal for

Weight-limited structures, roofs where every square metre has to count and tight roof space.

Watch-outs
56.9 kg per kWp

Bottom 3% of the TOPCon 600-650 W segment, against a median of 53.1. Ranked 10,921st in the whole database.

220.0 watts per square metre

Bottom 6% of the TOPCon 600-650 W segment, against a median of 227.7. Ranked 6,655th in the whole database.

22.00% module efficiency

Bottom 7% of the TOPCon 600-650 W segment, against a median of 22.80%. Ranked 6,517th in the whole database.

Notes from the database
  • Module efficiency of 22.0% is 0.8pp below average for TOPCon 600-650W panels (median: 22.8%)
  • 220.0 W/m² power density is 7.7 W/m² below TOPCon 600-650W median (227.7 W/m²) - requires larger installation area
  • Temperature coefficient of -0.29%/°C matches the TOPCon 600-650W median
  • At 35.0 kg (2.3 kg above TOPCon 600-650W median of 32.7 kg), requires checking roof load capacity
  • Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface

Specifications

Open datasheet PDF
Nominal power (Pmax) 615 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 22.00 % Weak Segment median 22.80%
Vmpp · Impp 47.24 V · 13.02 A Operating point at max power
Voc · Isc 55.79 V · 13.69 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2465×1134×35 mm · 2.80 m² of roof
Weight 35.0 kg Weak Weak · 2.3 kg above median
Cells 156 · TOPCon Monocrystalline
Bifaciality 80 % Rear output as a share of front
Coefficient Pmax -0.290 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.240 · 0.043 %/°C
NOCT 43 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 87.4 % Equals 538 W guaranteed
Degradation 1.00 → 0.40 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by Talesun in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 615 Wp appear here. The rest cover the whole series.

Linear Performance Warranty Linear Performance Warranty Whole series

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-
With bifacial gain
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.290 %/°C against a segment median of -0.290
-
Bifacial gain
Rear gain over light concrete: -
-

Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.

Filter these
Size
Panel Power Eff. Temp. Weight Difference
Talesun TM7G78M-615W 615 W 22.00% -0.290 35.0 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg +35 W, lighter, +3.2 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg +30 W, lighter, +3.0 pp
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg Cooler, lighter, +2.8 pp
LR8-66HVD-665M 665 W 24.62% -0.260 33.5 kg +50 W, cooler, +2.6 pp
JKM650-670N-66QL6-BDV (665W class) 665 W 24.62% -0.260 32.5 kg +50 W, cooler, +2.6 pp
HY665-B144DSS 665 W 24.62% -0.260 27.6 kg +50 W, lighter, +2.6 pp
SPDG665-BC132R12 665 W 24.62% -0.260 33.5 kg +50 W, cooler, +2.6 pp
TP7F78M-580W 580 W 20.70% -0.350 31.5 kg Hotter, -1.3 pp, -5 yr warranty
TP7F78M-585W 585 W 20.90% -0.350 31.5 kg Hotter, -1.1 pp, -5 yr warranty
TP7F78M-590W 590 W 21.10% -0.350 31.5 kg Hotter, -0.9 pp, -5 yr warranty
TP7F78M-595W 595 W 21.30% -0.350 31.5 kg Hotter, lighter, -5 yr warranty
TP7F78M-600W 600 W 21.50% -0.350 31.5 kg Hotter, lighter, -5 yr warranty
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +65 W, lighter, +3.2 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +60 W, lighter, +3.0 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +85 W, cooler, +3.0 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +80 W, cooler, +2.9 pp

Found 616 panels of the same or similar size to this one, within ±10 mm. See them here Found 616 panels of the same or similar size to this one, within ±25 mm. See them here Found 616 panels of the same or similar size to this one, within ±50 mm. See them here Found 1813 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
How much extra energy can the Talesun TM7G78M (BIPRO) bifacial panels generate?
Thanks to its bifacial design, the TM7G78M (BIPRO) module captures additional energy from light reflected onto its rear side. Depending on ground albedo (white gravel, light concrete, snow), the extra annual yield can range from a few percent up to the low teens compared to a monofacial panel. The gain is most noticeable in ground-mount installations and carports where the module is elevated above a bright surface.
How does the TOPCon cell technology in the TM7G78M (BIPRO) differ from older PERC cells?
TOPCon (n-type) cells have lower recombination losses and a better temperature coefficient than the previously dominant PERC cells, so they lose less power at high roof or facade temperatures. This translates into higher efficiency (up to about 22.7 percent for this series) and more stable energy output in low-light conditions, such as early morning or overcast days.
What warranty applies to Talesun TM7G78M (BIPRO) panels - product and power?
The TM7G78M (BIPRO) series comes with a 12-year product warranty covering material and workmanship defects, plus a 30-year linear power output warranty. This means the manufacturer guarantees a minimum power retention level over three decades of operation, which is a key factor when calculating ROI for large PV installations.
Are TM7G78M (BIPRO) panels suitable for large solar farms or ground-mount installations?
Yes, this is one of the series' main use cases. With up to 635 Wp per module, a reinforced frame, and enhanced PID resistance, fewer modules are needed and balance-of-system (BoS) costs are reduced across large areas. The bifacial design further improves the economics of solar farms and carports, where panels are mounted above bright, reflective ground surfaces.
What do half-cut cells with a 16BB layout provide in the TM7G78M (BIPRO)?
Splitting cells into halves (half-cut) reduces the current flowing through each cell, lowering resistive losses and limiting power drops caused by partial shading, such as from clouds or dirt. The 16-busbar (16BB) layout improves current collection across the cell surface and increases connection reliability, resulting in more stable energy production over the long term.
Does the IP68 junction box and PID resistance matter in humid or dusty environments?
Yes, this is an important safeguard for installations operating in harsh conditions. The IP68-rated junction box protects electrical connections from moisture, dust, and periodic submersion, reducing the risk of failure and contact corrosion. Enhanced PID (potential-induced degradation) resistance lowers the risk of power loss in hot, humid climates, which matters for large, high-voltage installations.
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